The pathogenesis of melasma is complicated.Genetic predisposition, female sex hormone and photoaging play predominant roles in melasma.While the current research in this field has focused on the effects of female sex Accessory hormone and ultraviolet on the melanogenesis, melanin transportation and distribution through paracrine regulation by keratinocytes, fibroblasts and vascular endothelial cells, the role of dermal extracellular matrix in hyperpigmentation is becoming the new hot spot.The important research area in the future will be to determine how genetic predisposition, female sex hormone and photoaging synergistically contribute to the development Unprocessed Brazilian Remy Wig of melasma.